P18B6 2014 GMC Sierra Code - Internal Mode Switch 'B' Circuit Shorted
Quick Answer
The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P18B6 2014 GMC Sierra indicates Internal Mode Switch 'B' Circuit Shorted.
- Common causes
- Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P18B6 2014 GMC Sierra Description
What are the Possible Causes of the DTC P18B6 2014 GMC Sierra?
- Faulty Transmission Internal Mode Switch
- Transmission Internal Mode Switch harness is open or shorted
- Transmission Internal Mode Switch circuit poor electrical connection
- Faulty Transmission Control Module (TCM)
How to Fix the DTC P18B6 2014 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P18B6 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P18B6 2014 GMC Sierra Code
1. What are the common symptoms of OBDII code P18B6 ('Internal Mode Switch 'B' Circuit Shorted') in a 2014 GMC Sierra?
The common symptoms include issues with shifting gears, difficulty engaging or disengaging gears, and the transmission not responding properly to driver input.
2. What are the possible causes of the Internal Mode Switch 'B' Circuit Shorted code in a 2014 GMC Sierra?
Possible causes include a faulty internal mode switch, damaged wiring or connectors in the circuit, a short circuit in the internal mode switch circuit, or a malfunctioning transmission control module.
3. How can I diagnose OBDII code P18B6 in my 2014 GMC Sierra?
Diagnosing this code typically involves using a scan tool to retrieve the trouble codes, inspecting the internal mode switch and its circuit for damage, and testing the wiring and connectors for continuity and proper voltage.
4. Can I continue driving my 2014 GMC Sierra with the Internal Mode Switch 'B' Circuit Shorted code?
It is not recommended to drive the vehicle with this code present, as it can lead to further transmission issues and potentially cause unsafe driving conditions. It's best to address the problem promptly.
5. Are there any DIY repair tips for fixing OBDII code P18B6 in a 2014 GMC Sierra?
DIY repair tips include checking the internal mode switch for proper operation, inspecting the wiring and connectors for damage, and ensuring all connections are secure. However, complex repairs may require professional assistance.
6. How much does it typically cost to repair OBDII code P18B6 in a 2014 GMC Sierra?
The cost of repairing this code can vary depending on the specific issue causing it. Simple fixes like replacing a damaged connector may be relatively inexpensive, while more complex repairs involving the transmission control module can be costly.
7. Can resetting the OBDII code P18B6 in a 2014 GMC Sierra make it go away permanently?
Resetting the code may temporarily clear the error code, but if the underlying issue causing the code is not fixed, it is likely to return. It's important to diagnose and repair the problem to prevent future occurrences.
8. How urgent is it to address OBDII code P18B6 ('Internal Mode Switch 'B' Circuit Shorted') in a 2014 GMC Sierra?
It is recommended to address this code promptly to prevent further transmission issues and potential safety hazards while driving. Ignoring the code can lead to more significant problems down the line.
9. Will OBDII code P18B6 in a 2014 GMC Sierra cause the vehicle to go into a "limp mode"?
Yes, in some cases, this code can cause the vehicle to go into a limp mode to protect the transmission from further damage. This mode limits the vehicle's performance to prevent additional issues.
10. Can a faulty battery or alternator cause OBDII code P18B6 in a 2014 GMC Sierra?
While a faulty battery or alternator may cause electrical issues in a vehicle, they are not common causes of the Internal Mode Switch 'B' Circuit Shorted code. It is more likely related to the internal mode switch, wiring, or transmission control module.
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